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diff --git a/gnulib-m4/extern-inline.m4 b/gnulib-m4/extern-inline.m4
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--- a/gnulib-m4/extern-inline.m4
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-dnl 'extern inline' a la ISO C99.
-
-dnl Copyright 2012-2015 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-AC_DEFUN([gl_EXTERN_INLINE],
-[
- AH_VERBATIM([extern_inline],
-[/* Please see the Gnulib manual for how to use these macros.
-
- Suppress extern inline with HP-UX cc, as it appears to be broken; see
- <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
-
- Suppress extern inline with Sun C in standards-conformance mode, as it
- mishandles inline functions that call each other. E.g., for 'inline void f
- (void) { } inline void g (void) { f (); }', c99 incorrectly complains
- 'reference to static identifier "f" in extern inline function'.
- This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
-
- Suppress extern inline (with or without __attribute__ ((__gnu_inline__)))
- on configurations that mistakenly use 'static inline' to implement
- functions or macros in standard C headers like <ctype.h>. For example,
- if isdigit is mistakenly implemented via a static inline function,
- a program containing an extern inline function that calls isdigit
- may not work since the C standard prohibits extern inline functions
- from calling static functions. This bug is known to occur on:
-
- OS X 10.8 and earlier; see:
- http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html
-
- DragonFly; see
- http://muscles.dragonflybsd.org/bulk/bleeding-edge-potential/latest-per-pkg/ah-tty-0.3.12.log
-
- FreeBSD; see:
- http://lists.gnu.org/archive/html/bug-gnulib/2014-07/msg00104.html
-
- OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
- for clang but remains for g++; see <http://trac.macports.org/ticket/41033>.
- Assume DragonFly and FreeBSD will be similar. */
-#if (((defined __APPLE__ && defined __MACH__) \
- || defined __DragonFly__ || defined __FreeBSD__) \
- && (defined __header_inline \
- ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
- && ! defined __clang__) \
- : ((! defined _DONT_USE_CTYPE_INLINE_ \
- && (defined __GNUC__ || defined __cplusplus)) \
- || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
- && defined __GNUC__ && ! defined __cplusplus))))
-# define _GL_EXTERN_INLINE_STDHEADER_BUG
-#endif
-#if ((__GNUC__ \
- ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
- : (199901L <= __STDC_VERSION__ \
- && !defined __HP_cc \
- && !(defined __SUNPRO_C && __STDC__))) \
- && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
-# define _GL_INLINE inline
-# define _GL_EXTERN_INLINE extern inline
-# define _GL_EXTERN_INLINE_IN_USE
-#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
- && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
-# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
- /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
-# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
-# else
-# define _GL_INLINE extern inline
-# endif
-# define _GL_EXTERN_INLINE extern
-# define _GL_EXTERN_INLINE_IN_USE
-#else
-# define _GL_INLINE static _GL_UNUSED
-# define _GL_EXTERN_INLINE static _GL_UNUSED
-#endif
-
-/* In GCC 4.6 (inclusive) to 5.1 (exclusive),
- suppress bogus "no previous prototype for 'FOO'"
- and "no previous declaration for 'FOO'" diagnostics,
- when FOO is an inline function in the header; see
- <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and
- <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */
-#if __GNUC__ == 4 && 6 <= __GNUC_MINOR__
-# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
-# define _GL_INLINE_HEADER_CONST_PRAGMA
-# else
-# define _GL_INLINE_HEADER_CONST_PRAGMA \
- _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
-# endif
-# define _GL_INLINE_HEADER_BEGIN \
- _Pragma ("GCC diagnostic push") \
- _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
- _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
- _GL_INLINE_HEADER_CONST_PRAGMA
-# define _GL_INLINE_HEADER_END \
- _Pragma ("GCC diagnostic pop")
-#else
-# define _GL_INLINE_HEADER_BEGIN
-# define _GL_INLINE_HEADER_END
-#endif])
-])